This problem shows the Frolkin theme with a Rook, a Bishop and a
Knight.

Natch solves this problem in few seconds:

3" on a Athlon XP 2800+ with 1 Gb of RAM

8" on a PII 366 with 128 Mb of RAM

1'13" on a P166 with 32 Mb of RAM

5'13" on a 486DX2-66 with 8 Mb of RAM

These results do not mean that Natch is able to verify every
problem. There are many kinds of positions where Natch needs
days, if not weeks, to find a solution. But hopefully it may
help SPG
composers.

Stable version

The current stable version is 3.1 (november 2016).

Most users having a Windows system will probably prefer the
ready to use distribution (as a DOS program). The default is
a 64 bits version, but a 32 bits version is also available for
older computers.

See the sidebar to download the files. The source files
have been compiled successfully on Linux and Mac OS.